The information in this document is based on these software and hardware versions:

Hardware: Cisco VCO4K, VCO20 and VCO80 products

Software: All Generics

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

"Echo Cancellation" is not a feature of the VCO/4K. In long-distance transmission, be it through microwave, submarine cable, or satellite, echo is almost always present and an echo canceller must be introduced when the echo becomes noticeable.